Sen. Grassley questions Toyota sudden acceleration probe

WASHINGTON — A U.S. senator has raised concerns about a government investigation of sudden unintended acceleration problems in Toyota vehicles, saying the probe might have erroneously ruled out the company's electronic throttle control system as a cause.

Sen. Charles E. Grassley (R-Iowa) said whistle-blowers recently have provided his office with information suggesting that the investigation by the National Highway Traffic Safety Administration, with the help of NASA engineers, "may have been too narrow."